WO1996037722A1

WO1996037722A1 - Improvements to means for clasping the extremities of the metal sheet forming tie-bands

Info

Publication number: WO1996037722A1
Application number: PCT/ES1996/000099
Authority: WO
Inventors: Ramon Palau Dominguez
Original assignee: Mikalor, S.A.
Priority date: 1995-05-26
Filing date: 1996-05-07
Publication date: 1996-11-28
Also published as: BR9606369A; DE69615127D1; US5740589A; AU5502796A; EP0777075A1; EP0777075B1; DE69615127T2; ES2126434B1; ES2126434A1

Abstract

Improvements to means for clasping the extremities of the curved elastic metal band (2), forming the body of the clamp, wherein one of the extremities (1), which corresponds to the tongue (3), has two protecting perpendicular small columns (4, 5), aligned one after the other, obtained by drawing the material of the band where said columns originate, and the opposite extremity to be overlapped (6), presenting two through-holes (11, 12) wherein are introduced the two columns when the extremities of the curved metal clamp are overlapped, by application of a temporary pressure, the rear column (5) avoiding negative rotary movements around its connexion point, the shape of both columns being optionally trunco-conical.

Description

"IMPROVED IMPROVEMENTS IN THE MEANS OF CLOSURE OF THE EXTREMES OF THE FORMAL SHEET OF METAL BAND CLAMPS"

At present, the clamps constituted by a metal band are known, of those of the type that at one end have a fastening guide tab while at the opposite end of the metal band itself there are hooks made near one of the ends of the band while in the opposite there are the hook openings, which complement each other so that once the metal band is wound on it, it is closed forming a ring.

This is the case of the Spanish Utility Model Nδ 42.946, by Mr. José Montaner Genescá, from 1954, for "COLLAR FOR TUBES, PERFECTED".

It is also found in the Utility Model No. 149.843 of Mr. Juan Gómez Larios, of the month of June 1969, for

Utility Model Na 260.128, by Hans Oeti er, A.G., dated 8/31/81, for "CLAMP STRUCTURE FOR HOSE PIPES"

Utility Model No. 257.616 by Hans Oetiker, A.G., dated 7/5/80, for "CLAMP STRUCTURE FOR HOSE PIPE".

Likewise, these metal bands constituting the clamps have protruding parts determined by an inverted "U", arranged in the circumferential direction of the clamp. These pieces of inverted "U" shape, also called "lugs", in the market, have the mission of allowing the constriction of the clamp, by means of jaws that their jaws tighten one in the opposite direction to the other until achieving deformation of said inverted "U" pressing radially against the inserted tube.

This embodiment of the "lugs" belongs to the public domain and have been known since 1958 according to US Patent NS 3,020,631, of E.R. Kennedy, for "Method for making pipe clamps".

U.S. Patent No. 3,106,757 of the year 1961 of R.L. Thurston et al.

Therefore in this type the alignment of the ends should be more pronounced in order to achieve a greater and more correct constraint.

In the type of clamps with known tongue mentioned above, there are also others that have guide means to avoid such lateral deviations.

This is the case of Utility Model No. 119.952 of the year 1966, of Mr. Emilio Valls and Mr. Enrique Prats.

They are also planned, to prevent the tongue protruding from the level of the surface of the end of the superimposed band housing chambers, of the tongue, as occurs in Utility Model Na 149.843 and in Utility Models NS 260.128 and 257.616.

It is also known in the metal sheet joining industry, by means of the juxtaposition of two sheets, to which a transverse, through hole is common, common to both, and then a riveted metal eyelet is introduced.

This execution is analogous to that which is carried out to fasten the corresponding metal buckle on the folded end of a trouser belt.

However, in the case of the ends of the belts, bent on itself and crosswise skewered the buckle bar, the union of the crimp bending of the buckle does not present the same problem as when it comes to the union of two ends overlapping, metallic, of the metal band that constitutes the clamp.

In the first place, the reaction of separation between the two ends of the ring that constitutes the metal clamp is much greater than that which can be offered by folding the end of the leather belt that forms the belt.

Therefore at the junction of the folded leather end of the Belt does not create such a strong force of separation as when the two ends of the curved metal band are coupled together under pressure, with which curvature the metal band becomes an expansive spring.

And in addition, in the leather material that forms the belt, the wall around the hole of the eyelet itself and that engages against the surface of the folded leather end, due to its soft quality, allows that when the clamps are tightened press the ends of the eyelet the edge of the wall is embedded in the leather material.

However, this is not the case in the case of hard surface metal band ends.

In this kind of union of overlapping ends by means of an eyelet, it is also of no importance that said eyelet allows the bent and joined end of the belt to be rotated, since the transverse bar of the buckle inserted in the loop of the folded end of the belt, together with the transverse pin inserted in the opening arranged at the blunt dihedral angle of said bent end on itself prevents negative rotation.

However, the exposed solution has defects in its application in metal hose clamps that are rubber tubing. All the pointed solutions do not give a security in the alignment, without lateral deviations, of the tongue of one and the other end of the metal band when it is forced to bend over itself overcoming the antagonistic action of expansive spring.

The lateral deviations of one end facing the other, under pressure, of the same formative metal band of the clamp are created by the tendency to separate the ends of the same metal band, in action of an expansive spring, whose antagonistic elastic force it is concentrated in the central part of the total length of the band curve, seeking in the misalignment of the two ends facing pressure, the escape generally in opposite directions to said antagonistic force creating the constant negative misalignment effect.

In the case of joining two overlapping ends, per testa, of the same formative metal band of the clamp body, the aforementioned solutions are not sufficient, to avoid these misalignments that due to the antagonistic action of the spring effect tends to have them constantly separated overlapping, facing ends of the same curved metal band.

Therefore, any small blow or push that is given to one of the overlapping and joined ends, known today, as occurs with the transfer of a place to another of the clamps before being placed around the rubber tube, it is sufficient to cause a small deviation from the misalignment of the two tension-overlapping ends and therefore protruding parts of the alignment line are negatively produced.

These projections, in addition, constitute a metal projection part, with edges that when the clamp is pressed against the rubber tube it comprises, produce negative pinches that even cause false seals.

With the object of the invention it is achieved that the alignment of the tongue of one end with the testa of the opposite of the same curved metal band, is perfect without the possibility of turning on itself at the junction point that prevents any possibility of lateral deviations despite the antagonistic action of the two ends of the same metal band that constitutes the metal clamp.

Also the object of the invention, facilitates the operation of joining the opposite ends of the pressurized curved clamp, to those people who must use such clamps, which are the users thereof at the time of placing them crossed over the tube flexible to constrain.

And thanks to the object of the invention, users only need a very simple tool to handle, such as of pressure jaws.

In addition, the riveting is unbreakable allowing its handling without problems in the assembly line.

On the other hand, when the connection by riveting is carried out by means of an eyelet independent of the body of the clamp that joins through one or another coincident hole made in two ends, overlapping, of the clamp, however tight the diameter of the eyelet and holes body, there is always a strike between them to allow the eyelet body to pass through.

When the rivet is made, in the known embodiment, it is that the end without a wall, protruding from the level of the mouth of the hole of the overlapped upper end, deforms and presses against the area around the edge of the hole of the upper end.

But it is very difficult for the eyelet body, that is, the section between its wall and the upper end deformed by the pressure exerted, also to be properly deformed so that the deformation of such section of the eyelet is the material that constitutes it stamped against the edge of the holes between which it has been inserted.

Well, this other problem is also solved when the circular bulge, which emerges from the surface from one end of the band is conical shaped.

It is evident that the same trunk conicity of the protuberance at the time of its introduction under pressure already performs an action with the edge of the hole, a constraining action of the frustoconical body introduced under pressure.

This action also facilitates, while the total winding of the metal band is carried out by the user during its placement in its assembly line that the introduced eyelets are dropped and the overlapping ends are separated at the time of assembly.

And it also avoids that due to this existing strike, although it is barely noticeable, between the diameter of the eyelet and the hole where it must be riveted, small rotary, pivoting movements of one end in relation to the other riveting occur.

Then these small movements increase their negative rotation as the clamp is subjected to lateral efforts diverting from one end in relation to the other of the band itself and joined together.

The following describes a case of practical implementation, by way of example, not limitation, of a clamp according to these improvements, accompanied by a sheet of drawings in which Figure 1 shows a metal band, open and partially wound on itself.

In Figure 2 a sectional detail of the same clamp of Figure 1, with its overlapping ends, joined by fastening, without having yet produced the permanent riveting joint.

In figure 3, it is on a larger scale, the union of one end with the other of the formative band of the clamp with the rivet of the eyelet when it has the shape of a conical spine, and

In figure 4 it is the same representation referred to the riveted cylindrical column.

The invention consists in practicing in the metal material itself that constitutes one of the ends (1) of the metal band (2) that constitutes the clamp, such as the one with the protruding tongue (3) of its testa, embedments (4 and 5) that on the opposite side they emerge perpendicularly in the form of colonnades.

At the opposite end (6) of the metal band itself (2), such as the one with the constrained "lug" (7) and the stepped (8) with chamber (9) deformed by drawing and two cuts parallel (10) for housing the tongue (3) of the opposite end, it they pass through holes (11 and 12) coinciding in position with the columns (4 and 5), when the curved clamp (2) has the opposite ends facing each other and in an overlapping position.

By making a greater approach pressure of one and the other end aligned, the temporary fastening, under pressure, of both aligned ends (1 and 6) is performed.

In this phase, if the placement of the clamp crossed around the constricted tube has not been correctly arranged, which can mean a negative result in the constricted, as usually occurs with the creation of folds of the tube wall when it has poorly arranged around the clamp, the user can start, again, without damaging the clamp, the operation of disposing the dogal around the tube.

Considering that the clamp is properly positioned, then the user is when, with jaws, under pressure, to carry out the riveting of one of the two columns, the first (4).

The riveting of this column (4) grants the permanent union of one and the other end aligned, overlapping the band-clamp.

However, this column (4) still leaves the possibility of that the two aligned ends, overlapping (l and 6), can have a rotary movement on their point of attachment and to avoid it then the user of the clamp, proceeds to rivet the second column (5) near the upper end, with which riveting is prevents rotation of one of the ends (l or 6) in relation to the other overlap (6 or 1).

It is evident that with the creation of the columns (4 and 5) of the band material itself (2), the operation of skewing any additional eyelet becomes unnecessary.

And in addition to the saving of this operation, the losses of eyelets already inserted are avoided, especially in the transfer from the factory to the user's point of use.

Another important detail, given the use of the clamps, is that at the end where the birth of the columns (4 and 5) occurs, the hole that originates with its creation, is not totally weakened, since the own material of the columns (4 and 5) give it the appropriate reinforcement, reinforcement that continues in the corresponding hole (11 and 12) of the opposite end (6).

Depending on the class of the position point of the clamps, it may be convenient that the rim (13) of the riveted column shown in large scale in Figure 4, not protrudes from the surface of the overlapping upper end (6). Then the columns (4 and 5) instead of being cylindrical are frustoconical (figure 3), so that at the time of the riveting the truncated conical walls are stamped in said shape against the metallic material of the holes (11 and 12) in the that are strung from the opposite end.

In this way, as can be seen in Figure 2, the joint is like a dovetail, which avoids the protrusion of the edge of the column.

It is understood that in the present case there will be variable how many construction and finishing details do not alter, change or modify the essence of the invention.

Claims

1.- Improvements introduced in the fastening means of the ends of the formative sheet of metal band clamps, which constitute the body of the clamp and which at one of the overlapping ends, aligned by testa, have an obtaining guide tab of the correct alignment and in the opposite the housing chamber of said tongue, determined by a stepping and drawing depression of the central part facilitated by two parallel cuts arranged in a circumferential direction, located next to a protrusion in the form of a transverse bridge in " U "inverted, with the union of its two legs in a circumferential direction, characterized by the fact that at one of the ends corresponding to that of the tongue, it has two perpendicular, protruding embossments, aligned one behind the other, forming each column one, of the material of the band where they are born, and at the opposite end to overlap, two holes, through, in which when he hugs Curved metal dera has its overlapping juxtaposed ends, at temporary pressure, the columns are temporarily strung together, until it is subsequently carried out, the opportune permanent riveting of permanent union being the rear column that avoids negative rotational movements around its point of union.

2.- Improvements introduced in the means of fastening the ends of the sheet of metal band clamp formation, according to the previous claim in which when it is desired to suppress the emergence of the end edge of each column of the surface of the overlapped end, then the colonnades are built in a truncated cone shape.